[vtkusers] triangle - triangle intersection VTK C++

[TJ Corona]

> Changing my code from TriangleTriangleIntersect() to TrianglesIntersect(), it
> seems to still give me some headache.
> I am still bit confused as why it returns 0, even if triangles go in to each
> other.


Is “it” the vtkIntersectionPolyDataFilter::TriangleTriangleIntersect() method or the vtkTriangle::TrianglesIntersect() method?

If the former, then the triangles are again coplanar. Please see vtkIntersectionPolyDataFilter.cxx:2060, where the method exits without continuing the calculation.

If the latter, then the method should return true for the triangles intersecting. If it doesn’t then this is a bug.


Thomas J. Corona, Ph.D.
Kitware, Inc.
Senior R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4443

> On Jul 21, 2017, at 8:34 AM, nolvis <fgr at lordsofts.com> wrote:
> 
> Changing my code from TriangleTriangleIntersect() to TrianglesIntersect(), it
> seems to still give me some headache.
> I am still bit confused as why it returns 0, even if triangles go in to each
> other.
> Am i missing something?
> 
> Picture: http://imgur.com/a/PMcRk
> 
> //1st triangle coordinates
> 0.0, 0.0, 0.0
> 5.0, 0.0, 0.0
> 0.0, 5.0, 0.0
> //2nd triangle coordinates
> 10.0, 5.0, 0.0
> 5.0, 10.0, 0.0 
> 1.0, 1.0, 0.0 
> 
> 
> 
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